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GPP3V3-25 Datasheet(PDF) 7 Page - Galaxy Power, Inc. |
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GPP3V3-25 Datasheet(HTML) 7 Page - Galaxy Power, Inc. |
7 / 8 page Polaris Series, Page 7 Part No. 99–003 Rev. 1.0 WWW.GALAXYPWR.COM Application Notes For the GPP5V0-15 and GPP5V0-20, the trim resistor, Rtrim for these two units is: 60.50 – 5.91 * Vo RTRIM = —————————— Kohms VO – 5 Thermal Considerations: Thermal considerations are an important factor in the reliable operation of the converter. The maximum operating baseplate temperature is 100 °C. The maximum recommended operating baseplate temperature is 90 °C. The baseplate temperature is a function of the losses within the converter, the converter ambient temperature, and airflow across the heat sink. The reference baseplate temperature is measured at the center coordinates of the baseplate. The baseplate temperature can be approximated by the following equation: 1- η TBASEPLATE = POUTPUT * —— * RBASEPLATE-AMBIENT + TAMBIENT η Where: TBASEPLATE is the temperature of the baseplate. Tambient is the local ambient temperature around the converter η is the efficiency of the converter (see Table on page 5) Rbaseplate-ambient is the thermal resistance from the baseplate to the ambient environment. This is a function of the heat sink and air velocity. Thermal Shutdown: The converter shall shutdown under a thermal overload. This is a latched condition and either the input voltage has to be recycled or the primary enable signal (P_ENABLE_L) has to be recycled to reset normal operation. Overcurrent Protection: The converter shall survive any overload condition indefinitely including short circuit. The values of current limit and short circuit shall be per the Output Characteristics Table. Overvoltage Protection: The converter shall be protected against any overvoltage across Vout pins by shutting down the output at the values specified in the Output Characterisitics Table. This is a latched condition and either the input voltage has to be recycled or the primary enable signal (P_ENABLE_L) has to be recycled to reset normal operation. Recommended Input Filter, Fuse and Case Connections: A fuse is required in series with the plus or minus side of the 48V input to meet safety requirements. The following input filter circuit is recommended for all applications. The fuse should be inserted between the capacitors and the plus or minus input of the converter. The case should be connected to the output return. Output DC/DC Converter RLOAD Input + – + – P Enable Case In (+) In (–) C3 1µF 100V C4 1µF 100V C2 1µF 100V C1 270µF 63V L1 Common Mode Inductor C1 270µF, 63V Aluminum Electrolytic Capacitor C2-C4 1µF, 100V Ceramic capacitor 48V RTN 48V L1 80 UH 1 2 3 4 In (+) In (–) ° ° + F1 |
Similar Part No. - GPP3V3-25 |
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Similar Description - GPP3V3-25 |
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